Method of forming cylindrical shells and assembling them with cores.



A. DOUGLAS.

METHOD OF FORMING CYUNDRiCAL SHELLS AND ASSENBLING THEM WiTH C0558;

APPLICATION FILED'JULY I, 1916;

A DQUQLAS all ,BRONSON} l" 1M ET E1035 OF TUBE/ENG C'i-ZL1'Nl] Rlt 13LSHELLS f N D'ASSEMBLZNG' THEIi'I WI E CUR iipphestion filed Enly 7.1915.

To Z W Hm it may m 1 m:

lilo ii known tlnn'pl, HARRY A. DOUUbAS, citizen of the United States,residing in: Bronson in the county of Branch and State of Michinnn haveinvented n certain new and nsei i implOKUYlBllD in Methods iof FormingCylindrical tihells null. Assembling Them with Cores, of which thefollowing is :1 full, clear ccneise. and exact description, referencebeing had to the nccoin imnying drawings, forming a part of thisspecification. I

My invention relates to structures employ ing tubnlnr' shells and coressurrounded thereby, such for example as are found in circuit couplers orconnectors, the invention having its object the provision of an improvedmethod of forming i'he shells and combining them with their containedcores. In practising :nv invention I employ a substantiallyparellelogrmnmstic sheet of metal and form in parallel edges thereofccmplemental parts of interlocking joints these eeniplemental partsbeing desirably in the form 01" dovetail shaped moitises and tenonsi Asheet of Ynetslthns modified is rolled o1 curled. into a tuhe that isdesirably cylindrical, the edge portions of the sheets in which thecomnlemeutei elements 01"." the interlocking joints-are ioi-ined beingbrought, into butt engagement with the compleinental members of thejoints interlocking. core adopted for tight diivin; lit within the hereof the shell is driven into the shell interior whereby the tenons andinoi'tiscs ei'c tightly pressed against each Ollie! of the abuttingdovetailed or interlocking fnces thereof. The core by eii'ecting;- this'tie ht engaging ")IGSSHTQ between the interlockiiw elements of thejoints prevents those elements from. being moved, out of the contour ofthe shell thereby to maintain such contour. The core also prc *ents theshell from being (collapsed since neither of the portions nnn'g ning thesloshing meeting edges of the curled sheet can be inwardly pressed atthe core.

In accomplishing these iesults theeore itself is tightly held in placeto have the desired assembly with the shell.

I will explain my invention inoi'eii'ully by reference to theaccompanying drawing in which Figure 1 shows a sheet of l'l'l'iifllhaving the formations thereon that enable it to he curled into :1tubular shell; FiglQ shows the sheet of l l curled with one of thenoi'tions to he 1 edge portions to he locked si.ip -?i )o ed noon theother in position to enable ti lee edge nought into interlockingengagement; Fi 3 shows the completed Lube; lfig. l shows 1' core andshell about to he assembled; l illustrates the core and shell inLSQHIiJl YQ and 6 is a loi'igitudiind sectional view of the product withother ]')tl1i',S con'ipleinentiil thereto when such prod-- ucl isin theform of a circuit connector.

Like pfilts are indicated by, Sll'llllzl-i Cll1llmeters of i'eiereneetl'ironghout Hie dillei'ent figures.

The ciiznit couple-i or Contact carrier illustrated inmndes acylindrical metallic shell 01 lube l. in which re is tighilj; insertedit Contact can-lying core insulating mutei'iiil and which 'i-i-iesspring *oi-essei eontncts 3 and 1 designed respectively i: on gngeinent.with contacts and t3 csrrie spcctively by the plug 7 and lump hose 8,the elem 'iliLS 7 and 8 having additional erminals 9 and it which are inthe form "1 metallic shells that are electrically connected by themetallic shell i when the eleine its 7 and 8 are rece' d Q T tact onetpins l receivable W1 1 formed n the shel l, t llclllp ftidineclninieiiilly to conpl 7 and S to inc-hide their contue circuit byway of the electric; contacts 3 and l and their in eircnit by wny of themetal is s in making this (leio ll'l i {Orin-ed 21s illnstinte-Ilafterward curled lo s evlin by the steps iilnstretel in s dovetailedtenons iii 16 he within correspondin mortises 17 and 1 ro. the i he zonewl said lei the circle 0": cg nter' oi the sl tions l5 l6 and 1!, 18eonstituting lIGlE- locking; elements at the. nhutt cling edges of theseznn. The edges oi he curled sheet of metal thus meet or shut insteadof overlapping whereby no thickened or: pro jecting seam results, thedoietziil formations zilloi 'ding ulmtiing edge surfaces that areinclined wilh respect to the axis of the shell. The core is (ltlYEllunder rcnsonnhlepres sure into the cylinder 1 to force the inclinedsurfaces of the tenons tightly into ahiu'zting tailed formation of themortises and tenons,

and the intermeshing edge portions of the rolled sheet are kept withinthe contour of the cylinder owing to the firm pressure of the dovetailfaces of the tenons upon the dovetail faces of the mortises, thispressure being exerted by the plug that is tightly 4lriven or'forcedinto the bore of the shell.

The core acts also to guard against the collapsing of the tube 1 sinceneither of the portions margining the abutting'meeting edges of thecurled sheet can be inwardly pressed at the core.

Having thus described my invention I claim aS new and desire to secureby Letters Patent the followin 1. The process of forming a shell andassembling it with a core therefor which consists in forminginterlocking dovetailed joint elements in two parallel edge portions ofa sheet of metal; curling the sheet of metal into a tube and bringingsaid parallel edge portions into abutting engagement and the dovetailedjoint elements into interlocking relation; andiforcing the core into thebore of the shell to effect and maintain tight engaging pressure betweenthe inclined edge portions of the dovetailed joint elements.

2. The process. of forming a shell and assembling it with a coretherefor which consists in forming interlocking joint elements in twoparallel edge portions of a HARRY A. DOUGLAS.

Witnesses HENRY C. B(

WILL M. Foe

